Burglar-alarm.



S. H. HARRINGTON.

BURGLAR ALARM.

APPLICATION FILED M05. 1914.

Patenmd Oct. 9, 1917.

2 SHEETS-SHEET I.

S. H. HARRINGTON.

BURGLAR ALARM.

APPLiCATION men 0505, 1914.

Patented Oct. 9,1917.

2 SHEETS-SHEET Z INVENTOR mechanism operated by the door;

smear. H. HARRINGTON, OF NEW YORK, N. Y.

BURGLARALARM.

Specification of Izetters Patent.

Patented Oct. 9, 191 7.

Application filed December 5, i914. serial'uo. 875,555.

To all whom it may concern.-

Be it known that I, SA UE II. Hana vo- 'ro-N, a citizen of the Unitedbtates, residing at the borough of Manhattan, in the city, county, andState of New York, have invented a certain new andus'efu'l Improvementin Bur lar-Alarms, of which improvement the fol owing is aspecification.

This invention relates to burglar alarms, and has for its object toprovide a simple and inexpensive mechanism which may be readily attachedto an ordinary alarm clock, and be operated by the movement of a door,window, or other closure, to actuate the alarm setting stem of theclock, and cause the alarm to ring. It may also be connected up to turnon a li ht and to raise the receiver hook of the telep lone instrument.

y improvement is particularly adapted for use in a bed-room of aresidence or apartment, where the clock may be placed upon a table,shelf, or other support in close proximity to the telephone instrument,and be readily connected to a chandelier or wall light, and a preferredconstruction comprises a frame for holding the casing of the ordinaryalarm clock and carrying a trip device for turning the setting stem tosuch position as will set off the alarm, there being a releasing meanscontrolled by the movement of the room door for starting the tripdevice. The releasin arm may also be mounted on the clock rame, andaccording to another feature of my improvement, is so connected With theW nding stem of the alarm that the alarm spring is automatically woundup by necessary movement of the releasing arm in settin thetrr device,This eliminates the possi ility o ne lecting to Wind up the alarm at thetime 0 setting the mechanism in osition for operating. The movement ofthe releasing arm when actuated by the winding stem at the time of theringing of the alarm may also be utilized for turning on a light and forraising the telephone receiver hook. v

In the accompanying drawings: Figure 1 shows, in front elevation,,thealarm clock and telephone instrument supported upon a. table and havingconnections with an electric light switch and with a Weight *ig. 2, arear elevation, upon a larger scaleflof the clock and frame with oneform of my im proved mechanism attached thereto; Fig. '3,

a side elevation of the same; Fig. 4, a front view of the door hookdevice for releasing the eight; Fig. 5, an end view of the same, showingpart of the door in section and Fig. 6, an inverted plan of the base ofthe clock frame showing the gage for defining the position of thetelephone instrument.

As shown in the drawings, there is rovided a clock frame, 10, of Wood,meta or other suitable material, having an opening of the desired sizeand shape to receive and hold the casing. 11, of an ordinary incxpensirealarm clock, having the usual alarm winding and setting stems, 12 and13, respectively. A trip device for turning the alarm settin stem ismounted on the back of the clock rame, and as shown more particularly inFigs. '2 and 3, such device preferably comprises a trip lever, 14, inthe form of a bell crank, pivoted at 17, to a bracket strip, 15, rigidlysupported on the back of the frame, and a tension spring, 16, attachedat its lower end to one arm of the trip lever and at its upper end to afixed part of the bracket strip, 15. On the end of the alarm settingstem, 13, is fixed a small pulley or drum, 18, having a flexible cord orchain, 19, connecting the same With the trip lever, 14.

When set in position for operating, the other arm of trip lever, 14, enages the releasing arm, 20, which is al so pivo-tally mounted on thebracket, 15, and the spring, 16, which is then under tension, issubstantially in line with the pivot, 17, 0f the trip lever so that ithas little or no effect toward turning the trip lever and the frictionof the parts is sufficient to hold them in position. The releasing armis preferably curved upward at its end and conn'ected by the flexiblecord or chain, 2 2, with the small drum or pulley, 21 fixed on the endof the alarm Winding shaft or stem, 12, of the clock. The arm is alsoprovided with an extension, 25, on the other side of its pivot, and maycarry a. movable Weight, 28, which normally holds the am against theupper stop pin, 23. In this condition there is no pressure exerted bythe releasing arm upon the trip lever, 14, but when the Weight, 28, israised from the arm, the pressure of the same acting upon the arm of thetrip lever is sufliicient to start the movement of the same upon itspivot, 17 and as the force of the spring, 16 tending to turn the triplever, increases as its effective leverage in creases, the trip leverwill be rapidly turned and acting through the chain, 19, and pulley, 18,will rotate the alarm setting stem or shaft, 13, sufficiently to set offthe alarm of the clock. During the ringing of the alarm, the Windingshaft, 12, is rotated by its spring, thereby winding up the chain, 22,and turning the releasing arm, 20, downward to its lower positionagainst the stop pin, 24, as indicated in dotted lines. In order toreset the trip lever it is first neces sary to raise the releasing armto its upper position, and in doing so the alarm Winding shaft, 12, isautomatically rotated by the chain and pulley connection.

Any suitable or preferred form of mecha nism controlled by the movementof the door or other closure may be employed for causing the release ofthe trip lever, but, as shown in Figs. 1, l and 5, of the drawings,there is provided a slillable and rotatable bolt, 30, mounted in abearing, 31, secured to the door frame and having curred hook, 232 and33, at its opposite ends, either book being adapted to support a weight,34', connected by a cord, 35, with the releasing arm or the counterbalance weight, 28, therefor. The hooks, 32, and 33, are preferablyduplicates and are fixed upon the opposite ends of the bolt at such anangle to each other that when the weight, 3%, is suspended on one book,the other projects inward toward the door and is adapted to be turned byengagement with the door when the latter is moved from its closedposition. Thus the preliminary opening movement of the door turns thishook and roial the bolt and the other hook sufficiently to cause theweight, 34, to fall, thereby exerting a pull upon the cord, 35, andraising the counter balance Weight 28, from the releasing arm, 20. Thecord, 8.), passes over a suitable number of pulleys or screw-eyes, 36,to give it the desired location and direction. By sliding the bolt, 30,longitudinally, the end may be Withdrawn from the path of the door whenit is desired to use the same freely Without in terfercnce With thealarm mechanism. The cord, 35, may also be connected by a branch cord,35*, with a switch, 38, for turning on electric lamp, 37. When thereleasing arm, 20, moves downward, the last part of the movement alsooperates to pull the cord, 47, which may be connected to turn on a lightor other signal.

This movement of the releasing arm may also be utilized for raising thereceiver hook of a telephone instrument, 40, and for this purpose theouter end, 25, of said arm is provided With a pin, 26, adapted to engagebeneath the hook, 43, of th receiver, 42, and raise the same to thecalling position, thus giving notice to. the telephone operator.

In order to readily adjust the position of the telephone instrumentrelative to the clock frame, a gage, 4-5, in the form of a semicirculararm, adapted to fit around the base, 41, of the telephone instrument,may be attached to the base of the frame, 10, and is preferably hingedthereto at 46, in such a manner that when not in use, it may be foldedbeneath the frame which is supported on four short legs. To adjust thetelephone to its proper position, the base of the instrument is pushedinto engagement with the curved arm, 45, and then turned therein untilthe side of the hook strikes the end, 25, of the releasing arm, 20. Thepin, 26, will then be in position to engage the receiver hook.

To set the alarm mechanism in position for operating, the trip arm, H,and releasing arm, 20, are turned to the positions shown in full lines,Fig. 2, thus automati eally winding up the alarm, and the setting stem,13. is then adjusted by means of a small handle on pulley, 1 to thedesired time.

The locking bolt, 30, is then drawn out in front of the door and theWeight, 34, suspended upon the hook, 33. The telephone instrument maythen be adjusted as above described. lnder these conditions, if the doorshould be moved from its closed position a slight distance, say from onehalf to three fourths of an inch, it engages the curved projection orhook, 32, and rotates the bolt, 30, and hook, 33, sufficiently torelease the weight,3-l,which then fallsand exerts a pull upon the cord,35, to lift the weight, 28, from its support on the releasing arm, 20.This weight may be provided with a slot, closed at its lower end, forengaging a pin carried by the arm, 20, in such. manner as to guide theWeight in its movement and prevent the same from becoming disconnectedfrom the arm. When the arm is thus relieved from the counter-Weight, 28,it acts upon the trip lever, 14, with sufficient pressure to start thelatter turning upon its pivot, assisted by the force of spring, 16,which rapidly increases as the lever turns, and operates to rotate theshaft, 13, of the clock to set off the alarm. The arm, 20, is then drawndown by its chain and pulley connection, to its lowest position andduring the last part of this movement pulls the cord, 47, to turn on alight, and raises the telephone receiver hook to calling position.

When setting the clock alarm by hand, the alarm pointer on the face ofthe dial is turned in the direction of the arrow to the time that it isdesired the alarm shall ring, in the usual Way, but it will be noticedthat whenthc setting stem .is turned by the spring, 16, of trippingdevice, it is rotated direction reverse to the arrow, the setting stemand pointer will stop at the time indicated by the hands of the clock,and cannot move beyond thispoint. It, therefore, the alarm is set byhand forsomc hour, say seven oclock, and the mechanism should then beset in motion by an i11truder at tempting to open the door,say at twooclock in the morning, the alarm setting stem and pointer will berotated by the spring, 16, to the two oolock mark on the dial where itwill stop and the alarm will be set off. This also serves as anautomatic indicator of the time that the attempt was made to open thedoor.

It will be observed that the bolt, 30, which projects in front of thedoor also serves as a lock tending to prevent the further movement ofthe door after the same has turned the hook to release the weight. Thiswill have the effect to delay the burglar in forcing his entrance intothe room and give further time for summoning help. This is an importantfeature of the invention, and it will be observed that with the form ofbolt shown, the allowable initial movement of the door from its closedposition is less than one half the thickness of an ordinary door, sothat the door is not open, but is locked against any further movement inthis direction, and there is no opportunity for the burglar to seethrough the crack between the door and its casing, nor to insert aninstrument between the same. During this permissible initial movement ofthe door, however, the bolt is rotated to the limit of its movement, andthe tripping mechanism, such as the weight and its connections, isreleased to set off the alarm and bring assistance before the intruderhas gained access to the room.

Similar door hook devices located in adjoining rooms may be connected upby means of branch cords or wires, 35 to operate the same alarmmechanism, if desired.

Having now described my invention, what I claim as new and desire tosecure by Let ters Patent is:

1. In a burglar alarm, the combination with an alarm clock having analarm setting stem, of a closure, and mechanism operated by an openingmovement of said closure for shifting the said stem to set off the alarmof the clock.

2. In a burglar alarm, the combination with an alarm clock having analarm setting stem normally adjustable in one direction, of a closure,and mechanism operated by an opening movement of said closure forturning said stem in a reverse direction to thereby set off the alarm.

3. In a burglar alarm, the combination with an alarm clock having analarm setting stem and a winding stem, of a trip device for turning saidsetting stem, releasing'means therefor connected with'th winding stem,aclosure. and mechanism operated by the opening movement of said closurefor actuatingfthe releasing means.

'3 In a burglar alarm, the combination with. an, alarm else 5 havingalarm winding and settin stems, of a trip devicefor turning siiidsetting stem, a re eiis'ingarmfconnected with said winding stem wherebythe alarm is wound up on setting the trip device, ,a closure, andmechanism operated by the opening movement of said closure for actuatingthe releasing arm.

5. In a burglar alarm, the combination with an alarm clock having analarm setting stem, of a trip device comprising a trip lever and aspring, a pulley fixed on said stem and a connection from said triplever to the pulley, said connection winding around said pulley, aclosure, and mechanism controlled by the movement of the closure forreleasing said trip device.

6. In a burglar alarm, the combination with an alarm clock having alarmwinding and setting stems, of a trip device for turning said settingstem, a pulley fixed on said winding stem, a releasing arm engaging thetrip device and having a flexible connection with said pulley, aclosure, and mechanism controlled by the movement of the closure toractuating said releasing arm.

7. In a burglar alarm, the combination with an alarm clock havingwinding and setting stems, of a trip device for turning said settingstem to set oil' the alarm, and 00 means operated by the movement of thewinding stem for turning on a light.

8. In a burglar alarm, the combination with an alarm clock havingwinding and setting stems, of a trip device for turning 105 said settingstem to set off the alarm, a telephone receiver and supporting hook, andmeans operated by the movement of the winding stem for raising thereceiver hook.

9. In a burglar alarm, the combination 110 with an alarm clock havingwinding and setting stems, of a trip device for turning said settingstem to set ofi' the alarm, a telephone instrument having a receiver anda hook for supporting the same, a gage at- 115 tached to the clock framefor defining the position of the telephone instrument, and meansoperated by the movement of the winding stem for raising the receiverhook.

10. In burglar alarm, the combination 120 with a door, and easing, of arotatable bolt mounted on the casing and having a curved hook at one endto engage the door and a hook at the other end for supporting a Weight,and means operated by the fall of 125 the weight for sounding an alarm.

11. In a burglar alarm, the combination of an alarm, a door. a lockingbolt for permitting a slight initial movement of the door from itsclosed position but less than 130 ated by said rotary movement of thebolt for setting ofi the alarm. V

'12. In a burglar alarm, the combination of an alarm, a door, a lockingbolt having a partial rotary movement for permitting a slight initialmovement of the door from 10 its closed position but preventing furthermovement thereof, and a weight adapted to be released by the rotarymovement of the bolt for setting off the alarm.

SAlWUEL H. HARRINGTON. Witnesses:

W. R. WARNER, A. S. FOWLER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents Washington, D. G.

